CODEWITHSUNDEEP
javapythonpython-3.xlistbase64
hanan
hanan

Reputation: 632

converting a base64 decoded string to list in python does not produce same result as in Java array output

I have a base64 encoded string pTWlzYwVk74RHlbhrHtYxjlmTpa1KY3LVj3X8o3PHUURfY07Qnk5wFPHP7SHDvoJSaM24DybXt20+ou3evsEmLNQfzsF2A1lfSsG2dIKf5Gmhb1qXVN7C6z1mJIRTWt99ei9A1Ozyc7et2DpKpX0SGIaKPcmf2TomYvt1Q+YWTaabUoue9BgI2VHb3L2f/UdRo5ja6beSeA= forexample, In Java when decoding this base64 decoded I get the correct result but in python different result. Here is the code I used. python code

decoded = base64.b64decode("pTWlzYwVk74RHlbhrHtYxjlmTpa1KY3LVj3X8o3PHUURfY07Qnk5wFPHP7SHDvoJSaM24DybXt20+ou3evsEmLNQfzsF2A1lfSsG2dIKf5Gmhb1qXVN7C6z1mJIRTWt99ei9A1Ozyc7et2DpKpX0SGIaKPcmf2TomYvt1Q+YWTaabUoue9BgI2VHb3L2f/UdRo5ja6beSeA=")
mylist = list(decoded )
print("mylist", mylist)

output becomes

mylist [165, 53, 165, 205, 140, 21, 147, 190, 17, 30, 86, 225, 172, 123, 88, 198, 57, 102, 78, 150, 181, 41, 141, 203, 86, 61, 215, 242, 141, 207, 29, 69, 17, 125, 141, 59, 66, 121, 57, 192, 83, 199, 63, 180, 135, 14, 250, 9, 73, 163, 54, 224, 60, 155, 94, 221, 180, 250, 139, 183, 122, 251, 4, 152, 179, 80, 127, 59, 5, 216, 13, 101, 125, 43, 6, 217, 210, 10, 127, 145, 166, 133, 189, 106, 93, 83, 123, 11, 172, 245, 152, 146, 17, 77, 107, 125, 245, 232, 189, 3, 83, 179, 201, 206, 222, 183, 96, 233, 42, 149, 244, 72, 98, 26, 40, 247, 38, 127, 100, 232, 153, 139, 237, 213, 15, 152, 89, 54, 154, 109, 74, 46, 123, 208, 96, 35, 101, 71, 111, 114, 246, 127, 245, 29, 70, 142, 99, 107, 166, 222, 73, 224]

and the Java side I have used like this

String str = "pTWlzYwVk74RHlbhrHtYxjlmTpa1KY3LVj3X8o3PHUURfY07Qnk5wFPHP7SHDvoJSaM24DybXt20+ou3evsEmLNQfzsF2A1lfSsG2dIKf5Gmhb1qXVN7C6z1mJIRTWt99ei9A1Ozyc7et2DpKpX0SGIaKPcmf2TomYvt1Q+YWTaabUoue9BgI2VHb3L2f/UdRo5ja6beSeA="
byte[] decoded = Base64.getDecoder().decode(str.getBytes(StandardCharsets.UTF_8));
System.out.println("myarray: "+Arrays.toString(decoded));

and output becomes

[-91, 53, -91, -51, -116, 21, -109, -66, 17, 30, 86, -31, -84, 123, 88, -58, 57, 102, 78, -106, -75, 41, -115, -53, 86, 61, -41, -14, -115, -49, 29, 69, 17, 125, -115, 59, 66, 121, 57, -64, 83, -57, 63, -76, -121, 14, -6, 9, 73, -93, 54, -32, 60, -101, 94, -35, -76, -6, -117, -73, 122, -5, 4, -104, -77, 80, 127, 59, 5, -40, 13, 101, 125, 43, 6, -39, -46, 10, 127, -111, -90, -123, -67, 106, 93, 83, 123, 11, -84, -11, -104, -110, 17, 77, 107, 125, -11, -24, -67, 3, 83, -77, -55, -50, -34, -73, 96, -23, 42, -107, -12, 72, 98, 26, 40, -9, 38, 127, 100, -24, -103, -117, -19, -43, 15, -104, 89, 54, -102, 109, 74, 46, 123, -48, 96, 35, 101, 71, 111, 114, -10, 127, -11, 29, 70, -114, 99, 107, -90, -34, 73, -32]

in comparison, the positive values of the two output is same but negatives the python version is outputting different result. why is that? what am I doing wrong? I saw a similar issue on here on stackoverflow, but Unfortunately does not resolve my issue.

Upvotes: 0

Views: 257

Answers (1)

talex
talex

Reputation: 20464

Those result are same.

In java byte is signed type, so values bigger than 127 are considered negatives.

Apparently in python byte is unsigned.

Upvotes: 2

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